What Is the Jewish Part?

I find it interesting to look at the personal testimonies and backgrounds of many people in the Messianic movement. Let's take Dan Sered, the head of Jews for Jesus in Israel, as an example.

According to him, he was born in a secular Israeli family who moved to New York when he was 15. It was in college that he met his future wife, Dinah, who had been raised Christian her entire life. Dinah missionized him and he decided to convert. He went to church and studied with Christians. In an article from the Jerusalem Post, it stated that he was baptized at a New York Protestant church. He is currently a pastor at All Nation Baptist Church in Israel. He is the leader of Jews for Jesus which was founded by Martin "Moishe" Rosen, an ordained Baptist minister. So, aside from birth there is nothing Jewish about him. Since college, everything about him has been Christian, particularly from the Baptist denomination. What is the Jewish part of the belief system of Dan Sered of Jews for Jesus? At this point, nothing.